首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1578篇
  免费   29篇
  2024年   1篇
  2023年   16篇
  2022年   27篇
  2021年   30篇
  2020年   47篇
  2019年   36篇
  2018年   45篇
  2017年   26篇
  2016年   37篇
  2015年   21篇
  2014年   33篇
  2013年   112篇
  2012年   101篇
  2011年   119篇
  2010年   87篇
  2009年   83篇
  2008年   137篇
  2007年   102篇
  2006年   105篇
  2005年   86篇
  2004年   64篇
  2003年   80篇
  2002年   62篇
  2001年   48篇
  2000年   50篇
  1999年   18篇
  1998年   8篇
  1997年   2篇
  1996年   3篇
  1995年   3篇
  1994年   1篇
  1993年   1篇
  1992年   2篇
  1991年   2篇
  1990年   3篇
  1985年   2篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
  1979年   2篇
排序方式: 共有1607条查询结果,搜索用时 203 毫秒
991.
In the aftermath of the Bolshevik Revolution, the British, German and Ottoman armies sought to exploit the chaos within the southern borderlands of the old Tsarist Empire. The Ottomans primarily sought to recover lands lost in the nineteenth century while for Germany, expansion into the Black Sea littoral not only broke the Allied Naval Blockade, but also offered the possibility of menacing British India via the Central Asiatic or Transcaspian Railway. Britain's involvement in Transcaucasia during the final months of the Great War has received relatively little scholarly attention, being seen as little more than a bargaining chip to be used at the Paris Peace Conference. This article suggests that the true aim of Lord Curzon's Transcaucasian policy was the incorporation of Persia into Britain's informal empire, a task that he doggedly pursued all the way down to the 1923 Lausanne Conference.  相似文献   
992.
It is the natural order of states and their governments to periodically upset the constructed balance of power and to subsequently seek out a ‘reset button.’ Such was the case following the First World War when the European map was redrawn and East Central Europe took on the appearance of a fractured and contested zone. What emerged from the confluence of four defunct empires was a collection of newly fabricated or reconstituted states vying for existence in a traditionally contested zone of influence. In October 1921, the Successor States of the Austro-Hungarian Empire convened a conference in the Adriatic town of Porto Rose to negotiate the details of commercial relations amongst themselves and to determine the broader economic character of the region. For Czechoslovakia – the most industrialized and arguably the most Westernized of these states – the conference presented an opportunity to promote its foreign economic agenda. This study represents a unique examination of the first international conference held among independent East European states and the importance it held for Czechoslovakia's foreign economic-policy objectives in the years following the First World War. At the same time, the study suggests connections with more recent overtures toward economic integration.  相似文献   
993.
This paper uses macroscopic and radiological examinations to provide differential diagnoses of pathological lesions in the well‐preserved skeleton of a young male from the medieval site of Zalavár in South‐West Hungary. Macroscopic inspection of the skeleton revealed conspicuous thickening of the tibiae and fibulae with ‘tree bark’ appearance of the cortex. Periosteal proliferations are also found on the calcanea and on the posterior part of the femora. The metatarsals showed bony proliferation and bone dissolution. No alteration of the axial skeleton or the skull was noted. Radiographs showed thickening of the cortex of tubular bones due to a multilayered type of periosteal apposition. The likelihood of these symptoms being the result of melorheostosis, hypervitaminosis A, fluorosis, thyroid acropachy, endosteal hyperostosis, tuberculosis (TB), hypertrophic osteoarthropathy (HOA), treponematosis and leprosy is reviewed. None completely explains the entire spectrum of pathological lesions in the current individual, but the individual may have suffered from two co‐existent diseases. As a clinical entity, the changes in the metatarsals are compatible with leprosy, whereas the periosteal proliferations of the lower limbs point to a diagnosis of HOA as a secondary syndrome. Thus, a combination of leprosy and TB is suggested as a potential diagnosis. Although not definitive, our differential diagnosis was able to exclude a number of conditions producing periosteal apposition. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   
994.
In light of the extensive presence and preservation of communal property and resources in territories in mainland Spain, the aim of this paper is to analyse the keys to the use, distribution and retention of such properties and resources, particularly those still in existence, with particular regard to common pasture lands and woodlands. A compilation of council by-laws from past periods, combined with the production of a catalogue of agricultural patterns, has enabled an in-depth study of certain fundamental points relating to social and economic development. Such development has tended to maintain the balance between resources and population and to conserve resources through sustained and sustainable use that to some extent has guaranteed the occupation of lands, the preservation of rural communities and the perpetuation of traditional systems in the context of new challenges and contemporary needs. A combination of qualitative and quantitative documentary sources has enabled elucidation of the role and the full dimensions of communal properties. In particular, the causes and consequences, either of their sale or privatisation, or of their preservation and exploitation, will be outlined in the context of changes and new contemporary needs.  相似文献   
995.
本文探讨了长沙汉墓随葬品不同"动物"形象所蕴含的不同的人文观念,借用美术考古学家的"器物观念"概念,分析不同"动物"形象背后隐含的古人精神世界。笔者将"动物"形象分为现实动物形象、神话"动物"形象和"动物"组合形象三类,分析其所依次表现出的"事死如事生"的世俗观念、以龙凤为主的神话观念和"天地相协"的理想观念。  相似文献   
996.
文物清洗是文物修复中极为重要的一环。针对质地疏松、时代久远、埋藏环境较为复杂的出土陶器,表面清洗是一种较大的挑战。本次清洗的对象是馆藏的汉代彩绘女陶俑,陶俑身上遍布黑斑,严重影响了其观赏价值。为有效清除表面黑斑,尝试运用激光清洗技术进行清洗工作。确定采用LQS模式下,输出能量为150m J,频率为3Hz的系统光学参数,并选择光斑直径在3~4mm的范围,用激光垂直照射液膜法进行清洗。结果发现部分区域清洗效果较好,而部分区域清洗效果一般。造成不同效果的原因,主要在于黑色污染物与基底之间的关系以及激光能量的选择。实验结果证明,激光清洗陶器表面的黑斑是可行的,与此同时也可以结合不同的清洗方法来达到最佳的清洗效果。  相似文献   
997.
Here we report the bone collagen carbon and nitrogen isotopic results of humans (n = 33) and animals (n = 58) to reconstruct the dietary practices of an early Qin population dating to the Zhou Dynasty (Late Western–Early Eastern period ca. 700–400 BC ) at the Xishan site in Gansu Province, China. The humans have a very large range of δ13C (−23.3‰ to −7.1‰) and δ15N (4.3‰ to 10.9‰) values which reflects extraordinarily diverse diets and included individuals with predominately C3 as well as those with exclusive C4 diets. This wide span of isotopic results produced a subtle linear trend (R2 = 0.62) in the human data, which paralleled the animals across the C3 and C4 environmental gradient. However, the majority of the individuals had a predominately C4 diet based on millet with δ15N results only slightly elevated above the animals, except for the pigs and cattle. This is evidence that many of the animals were likely used for their secondary products, labour or as sacrificial offerings and that pork and beef were the main sources of animal protein for the population. High status individuals had elevated δ15N values (10.2 ± 0.6‰) compared to medium (8.9 ± 0.3‰) and lower status (8.8 ± 0.8‰) individuals, possibly related to increased animal protein in the diet. Differences related to gender were also found with females having elevated δ13C (−11.2 ± 1.9‰) and δ15N (9.4 ± 0.8‰) values compared to the males (δ13C = −14.1 ± 4.2‰; δ15N = 7.9 ± 1.9‰), but these results necessitate caution given the large number of individuals that could not be sexed. The results of this study support the view that the early Qin people were a more sedentary society focused on millet agriculture and animal husbandry, and that they were influenced by the pre‐existing populations of the central Gansu region. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
998.
This paper deals with the remains of butchered dogs from the La Tène and Early Roman sites in northern Slovakia. A large settlement revealed at Liptovská Mara was inhabited by the Celtic tribe of Cotini, representing the so‐called Púchov culture. The long‐term excavation of the site has yielded one of the largest collections from that time in Slovakia. During archaeozoological analysis, the skeletal remains of dogs were identified. Interestingly, a large portion of the specimens represent the cranial skeleton, and the majority of mandibles bear distinctive marks of butchery. On the basis of their placement and similar characteristics, the authors conclude that they resulted from tongue‐removal procedures. Moreover, their frequent occurrence clearly supports the idea of the use of dog flesh at the site. The authors argue that cynophagia occurred mainly for economic reasons; however, it might also have been part of the rituals documented in the sanctuary of Liptovská Mara. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   
999.
云南汉族分布区发展最快的时期是明代。明代80余万汉族军事移民大规模进入云南,深入传统的当地民族世居区或边疆地区,建立卫所,定居屯田,促使云南涌现出大量的汉族移民新区,形成相对稳定和独立的汉族社会和汉夷杂居的发展趋势,基本奠定了明清以后直到今天云南各民族分布格局和民族交融的基础,成为明清以来云南边疆开发和社会变迁的重要推动力。  相似文献   
1000.
中国六朝各朝代一直与朝鲜半岛保持着密切的关系,尤其与百济之间有着不同形式的交往。迄今为止,在韩国百济故地已出土了不少中国六朝时期的陶瓷,这些器物可证实当时文化交流的部分情况。本文对其中保存较完整、时代较明确的几件器物进行了初步地分析和比较,并试图探讨这些器物的输人途径、烧制窑口、年代等问题。随着中国国内对该时代墓葬和陶瓷研究的进一步深入,必将对韩国的有关研究起到重要的参考和借鉴作用。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号